Steps to create 3D printer acceptable file what is correct order?

So you do. Good luck…

Hey Steve,
I have a pretty standard list of checks I do-

selbad
selopenpolysrf
showedges (show naked)
check

if the polysrf model passes all those, I then run the mesh command so I can control the density and poly count.

I run triangulate mesh simply so I can see the triangles before I export them… this as others have pointed out is likely unnecessary, but I’m a wysiwyg kind of person, so I like to see everything laid out in front of me before I export a file.

here’s where things get interesting…

I have had situations where the Bambu slicer does not like a mesh from Rhino for some unknown reason… I then export as a Step file and let bambu slice it and all works as expected.

so…as I have learned more about my own printer, I go back and forth using step or stl…

if I’m doing a very detailed part with displacement textures etc…I’ll definitely mesh the part myself.

If I’m doing day to day bread and butter kind of printing, I’ll export step and let Bambu slice it.

In the end, what you should be doing is what works for your situation and specific printer.

hope that helps.. happy to answer any questions where I can be useful.

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Hi,
Thanks for input here,
I hope that answers those that say no need to.
I just follow what I am told is best practice, some alternative ideas existing.

I sent my bureau :-
export as step, import into Prusa, look for warning triangle, NONE, export as stl. That’s SR7a
but then..export as stl from Rhino8, check in Prusa ok, that’s SR7b
Import that stl into Rhino8 and run TriangulateMesh. And export out as stl That’s SR7c
Then take that and import to Prusa, and right click repair windows algorithm, that’s SR7d

asked them to let me know which works. I will follow the best one as a process.

and your steps are part of mine.
what is ‘check’ ?

so all I await are prints not featuring what looks like particles of salt now, or clusters of grey bees.
as 1 year on and still such occur..

Steve

seriously? You really don’t get it.

Not sure who you are attacking, as I understand triangulation is not needed as stl triangulates,
I also am not gong to criticise KH for his reasons for still doing so, even if apparently you wish to.
I was saying he has explained why he does so, so answering those that say no to it.

Steve

check is a simple command that lists very simply, whether a part is good or not-

I use it to quickly ID anything that is amiss.

since the sentence “rhino polysurface object is valid” is repeated for each object and is all the same length in the dialog, you can whip down the list quickly with the scroll bar and it’s easy to visually notice if there is a different length sentence… that tells me there is something to dig into.

then I jump into selbad, selopenpolysrf, etc…

Hi,
Thank you Kyle, now added to my checklist of making a 3D print file .

Question to all,

of my four variants of my object, (see post above),
Chitubox says 7a 7b 7c and 7d all are undersized., why is that ?
Prusa ok on size but places them all one on top of another. !
Any Cubic is ok with them all and doesnt do the above.

So how to export my Rhino8 object as stl keeping the 25 x 25mm XY size.?
I see no size input option when exporting as stl.

I also try .step and send that, and chitubox doesnt like it at all.

I also try .3mf which I gather is the ‘latest kid on the block’. I see no option to enter a size.
Here is what it looks like imported back into Rhino8.

A MESS.

Steve

may want to mesh you part 1st before you export 3mf.

sadly that export does not appear to have any meshing options so you get whatever Rhino gives you.

Stl does not have any specific type of units associated with it, so you often have to specify what unit system you are using when you import it.

it known’s it’s “this many” units long, but does not know what those units actually are.

that said, you case where it’s actually changing sizes is weird, unless there is a millimeter to inches conversion thing going on.

I have learned over the years to always work in MM if I’m going to a printer. Most if not all printers work in mm, and if I stay native to that all my conversion and scaling issues go away.

Hi Kyle,
I will try meshing then .3mf export, and work in mm, or convert the project to mm for the export.
Thanks for the tips.
This project is and always has been mm small, so why their slicer showed it as smaller than 25mm is cause for concern.
I see Prusa shows it as 25x25x3mm which is correct,
Steve

I’m not really following why you need all these steps. You’re starting with an STL file - just drop it into your slicer and print? The only time I take an STL into Rhino is if I need to modify the part.

As for regular nurbs geometry again - I don’t see the need to mesh then export as an 3mf. You can omit the meshing part and just export your geometry to STL or 3MF.

Here’s the STL from your first post dropped right into chitubox - it’s the correct size. Nothing needs to be done in Rhino.

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